Answer check? 15 points.

charlie solved an equation, as shown below:

step 1: 5x = 30
step 2: x = 30 – 5
step 3: x = 25

part a: is charlie's solution correct or incorrect? if the solution is incorrect, explain why it is incorrect and show the correct steps to solve the equation.

part b: how many solutions will this equation have?

my
you would actually use division rather than subtracting, giving you the answer x = 6. there is only one solution to this one step equation.

Write the rational number in lowest terms 99/-15

This is about circle theorems. someone asap : (

Carla was trying to decide what to do saturday evening. she has $100 available to spend for the evening. she has narrowed her choices down to these events: braves game, a concert of an artist she likes, or the georgia aquarium. admission to the braves game is $25, hot dogs cost $10, sodas cost $5. the concert costs $25 for admission, $20 for a souvernir t-shirt, and $10 for a soda. the georgia aquarium has the show of a lifetime with an all you can eat and drink that costs $100. carla does not want to take any driving chances, so in addition to the cost of the aquarium, she will also need to pay for her uber/lyft, which is $15 each way. which option should carla choose if she wants to spend the least? based on that choice, what then is carla's oppotunity cost? fully explain your answer in at least one paragraph.